Artificial tooth.



S. S. BLOOM. ARTIFICIAL TOOTH. urmonxon FILED 4119.14, 190a.

Patented Jan. 5, 1909.

3111mm tor SAMUEL s. BLOOM, or PHILADELPHIA, ream-(man.

aivrrrrour roo'rn.

Specification of Letters Patent.

" P'n'tented Jan ,5; I009.

Application filed au m 14, 1908. Serial. 110.458,!506.

To-oll whom it may concern: I

Be it known that I, SAMUEL S. BLooM, a citizen of the United States, residing at Philadelphia in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification.

This invention relates especially to that type of artificial teeth com rising porcelain crowns or facin and meta backing or has tening plates, w ich have a sliding or dovetailed connection, this construction being employed moreparticularly for crown and bridge work.

Although, in'the accompanying drawings, I illustrate the invention "in connection with forms of orcelain bodies and plates which are usua y sold to dentists in separate or separable condition, so that the dentist may cut or trim the plates to suit a articular piece of work while the porcelain odies are removed from the plates, yet I desire to be understood as not limiting myself to the particular embodiment illustrated, as the invention ma obviously be .applied to other shapes 0 tooth bodiesand lates.

' Whena porcelain body aving a dovetail groove or rib is baked without such groove or rib havin a metal lining or facing, the

shrinkage 0 said body due to the baking operation is liable to change the shape of the groove or rib so that it will not pro erly slide into engagement with the coactlng ovetail rib or groove of the backing or fastenin plate. It is therefore customary, in suc forms of artificial teeth, to employ a lining or facing of metal, such as platinum, forthe groove or rib of the tooth body. Usually the dovetailed sliding connection is provided for by forming the groove in the porcelain and the rib on the plate, and I so illustrate it in the accompanying drawings; but it has been proposed to reverse this relative are rangement of the cove and rib, and there fore I do not limit myself to forming the groove in the porcelain although it is preferable to so make it.

So far as I am aware, the coacting surfaces of the relatively slidable dovetail members of the porcelain body and plate, have been smooth. To secure them together therefore, it has been necessaryto employ cement or solder, and cement will not always take a positive and durable hold on such smooth the plate .12.

A surfaces. One of the objects of'my invention therefore is t6 provi e a constructlon in which the-two metallic surfaces whlch'slidingly engage each other will interlock with each other, with or without the addition ofcement or solder, the construction being such that if the dentist finds'that' for some urposes the interlocking of the metal aces directly will perhaps not be sufficient, he may add cement or solder without altering, in any way, the form or structure of the coacting groove and rib.

Another objectofthe invention is toprovide an improved structure of backing or fastenin plate having a dovetailed rib especially a apted to coact with a metal-lined groove in a tooth bod where the opposing metal faces are forr'ne to interlock.

To these ends the invention consists in the construction and combination of .parts substantially as hereinafter described and claimed.

Of the accompanying drawin :-F1gure 1 is a front elevation of an artificial tooth and its mount embodying by invention. Fi s. 2 and 3 represent respectively a longitu inal section and a transverse section through Fig. 1. Fig. 4 is a view similar to Fig. 2 but representing a modification hereinafter described.

Similar reference characters indicate the same or similar parts in all of the views.

The porcelain tooth body shown at 10 as a crown or facing, is formed with a dovetail groove havinga metal lining 11 which linin is referabl in position when the body 18, ba ed and 1s therefore preferably made of platinum. The face of this lining1 which forms the bottom of the groovei'n t e completed article is toothed or corrugat i as The backing or fastening plate 1 is pro-' vided with a dovetail rib 18 the face of which is toothed or'corrugated, the relative positions and forms of the two toothed or corrugated faces being such that the be forced past each other when sli ingly interengagcd, and will be in interlocked positions when the lower end of the rib reaches the bottom end of the groove as shown in Fig.2.

The dentist may, when occasion requires, apply cement or solder before sliding the parts to ether. The ri 13 is referably not integral with more economica way to,

clan

make the plate 12 with an accurately farmed rib is to construct lhcm separately, the tcs-iii or corrugations: of the rib being ffil'll'h'i'd before it scoured to the plate. To provide a firm and reliable connection betwccn Kim two, I form the plate with' an elongated slol: 14, and. the rib with a pro'ectinn 1.5 which accurately fits, said slot an is of a slightly greater lici hr than the thickness of the plate, sl'mul c1! 16 being for'n'icd at this sides. When the projection 15 is passed through the slot 14 unicii the shoulders 16 bear on mic face of the plate around the slot, the tip cl. the projection is headed down around the margin of the slot against the other fan; of thc plate, thus practically riveting the rib to the platc. This structure enables the ribs; to be formed accurate! with a face that will interlock with the lining 11 in the manner described, whileit. woulci be difficult, if mt impossible, tn get the same degree 0f accw racy on the fncc cf a rib bent up fI'CI'Fl a portion of thc platitself.

The inierlucking opposing faces may cozm was, H48

prise rounded cczz'i'cgaticm w: Endicuiw'i in 3:; Fig. 52, or angular UIIPJ; as Ulil'fifiiiiii in Fig 4 llavm -g'nmv described my invention '1 claim 1.. An :irliiiciaHuoth body and its mount having a dmrctail vii) mm was; conneccian sin adapted to bc usmmaabled by; a vcvticul gliding movement, thcrib ais'ld ruccss ha ving; it""fliii verse opposing face-5 fi'urmccl mierlocic 93. An arlificiiii bath bariy having :1 (lavetail metal-lined groove, and a: backing OPZJ fastcning plate hflw ng a rib to 606612 with said gri'mvc, Hm lining Raid grnove ans? the surface of the rib aving 1runs'vxwc, jcctiunsi I An artificial 120th hm}; iur-xirzg 5; im/g tail groove provided with a ilirunsvsrsely corrugated metal lining.

In testimony wiierenf Iaffix my si nature: in presence of two witna;

" SAiifi'L Witnesses:

M. L. Mnnwnm,

Aim. W. Wnmnmrnm. 

